SQUEALS IN THE BRAKES ARE CAUSED BY SEVERAL FACTORS:
Brake Vibrations, Squeals and Screeches
DUST OR RUST ON THE ROTORS OR DRUMS (SETTING UP OR PARKED FOR DAYS AT A TIME)
GLAZED ROTORS OR DRUMS (MIRROR FINISH)
DEFECTS IN BRAKE PADS AND SHOES
(BUBBLES OR GOUGES IN THE MATERIAL ITSELF)WEAR SENSORS OR TABS, RUBBING THE ROTORS
DEFECTS IN ROTORS OR DRUMS
VIBRATIONS OR BRAKE PEDAL PULSATIONS
HARD SPOTS AND HEAT CRACKS
BROKEN OR RUSTED OUT ROTOR VANES
WARPED ROTORS OR DRUMS
LOOSE OR BAD WHEEL BEARINGS
WORN SUSPENSION COMPONENTS
Warped drums are usually caused either over-tightening the wheels, improperly using the parking brake, bent axle shafts or bent suspension components. Below are some pictures of some OE and quality after-market rotors versus economy brands.

Here is a picture of how the vanes cool off the rotor
This is what happens when you ignore the squealing (this car drove in)
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When do I change my oil•
Freon changeover•
Why did I fail my emission test• Wiring Diagrams
• TSB's and Recalls
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OBD II CODES•
Oxygen Sensors•
NOx FAILURES•
Timing Belts_ 1970-1997 Domestic & Imported Cars
Last Updated on 3/15/2006
by Scott Throneberry
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